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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55f8bb1c10c56a0b6b57ba7d55fb92db3db0b7418be686c5a52612a639e3c41' 
  AND token = '7lUBj0SYItNYok7Jpt7NMMgCXO5pSUuZHJLelKCzAjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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