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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f95b3cf274f05d646c9ec24def29fb3ed1eb2082389a7ed7f6f621a6f1359e2' 
  AND token = 'ufpZ5bUI+Mc0sVv6G9IVkZfU99B+qQy1q8zhs7GS/7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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