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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014fb68a1d0ddb3be490f55a17a071cbb7f4e9c8d72acb4d1447c6c8cd3131d6' 
  AND token = '01w3E6r5gYeQ70hOpg3kGvlAD5QMkz0wyP9HAGOTMSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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