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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d5cb04d1b211e04e19130c95a6cb34c53a06ec53c76780f6c26c4f3eebf132' 
  AND token = 'FqlhadRQ1wqDPIHOXu8TepT2x40NneLgxdxVxnmq4OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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