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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69ee3846b02d4a7a08f7db4cd045e2d5d3922ed887954d0127ee65c1d55df98' 
  AND token = 'u+yvsTHG06HtGUsGjXNMeN77POa4SSB0hep7Kt5J5VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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