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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d467348c98b79d79d3cb85ee0acab47e25dfab657b15792c0df26c7fbe86ceb' 
  AND token = 'o9cdsBzlCiBUnA5Dt3QJsIkE+J8Z4HOLSqxmY2U6cCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}