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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84bcc6083a95fb2861006893dce015ba9e0a83ecd697c62065d703b776eeec6' 
  AND token = 'm1O9Gpc7nsfJS4Hatj8+BLhBYmBvsaa5bB8uwpVZT70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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