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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7334bdc5a896ee92405ae44ae00bcd06e1ab587b2945b37968603d05bad33c77' 
  AND token = 'wY5+6xvZmjOfPlOkp7xWXMwkheC01AIno4PWZZyUwdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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