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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c593fdd840dc0b22ccc2b1bc58b9a2d1aa054bec8b721fb07ac105dda794e3c4' 
  AND token = 'li1Wlm6qAdGu5z6eY7B1E0BO7ZyoS+fKxNEJP0GPHE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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