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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c10cdff3ab39483f2d0126e809a92b932c36bb7a67a9efc2ea529b455b7d8d' 
  AND token = 'pC5w1tqc19auZWIWhQRyRp8KxQj0jDRxojZHXhjHtfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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