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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92ec5f71c9f9b83560ad0eb00dd9cd7551d92b2786dac6de1d19ac7ea6fcc23' 
  AND token = 'OEwqxM8mG3wfZxGdjSakQPpiqWH7OWSEQuD5kLrlQlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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