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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0cd98b5d936532ba8318d502220419c12b00283c32f48722b575dad122e6f6e' 
  AND token = '2uB4VIYXfklw/leyNP5gYrS7O8RHAF5VN/PESwqouvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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