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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acf3dfea8db0a63215b3962ae38c9af7af0add790f9733a7bc0eae02a37f1766' 
  AND token = '3DcKMb9N6GZiROU6aFMJXrHOOu8EwsJ9tIIFpvgUeiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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