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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47585e9f405409a71292d7817daa433345164668879b40c4dc4da36735d13b5' 
  AND token = 'dBb7DYFqPY4MIYOQVc0fROGb+aBla6vbqAPMGUzuOrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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