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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b5aba5b8cb417754732e8fc8dafb29ec788126d7582f47fc8f94d7d7d4265e' 
  AND token = 'Fb3FSY1/ezaUZ82tKsnV4FVj7OkHp5JO+LOCQgUTkfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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