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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3d693983137ace247949321a1f58fd194444a19a6cd4e67305ba6f67d7cb14' 
  AND token = 'tmyY3hCgm7ePp4Fk365HeJPEGYZpS+1Kukmlkrxly/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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