SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7025fdbe7bc42c4569097615e8d4b9332a6c65403e109f7a32738ba4c68fa1' 
  AND token = 'LwvIYKWw4S/5vFroe4H7QebSjQyNfZZjsWoJkqv5w3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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