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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd1d02df2662ca5b536de8902c3e31e36e770a065360d81e8508d225433b72c' 
  AND token = 'YOH9BFlCZ5WIBdXjhlZZRaVVH6J/iLN1+CryAHenW+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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