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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9c2de797d09eb9cbeca9b9a6dba400622b306c751afb278243abe154761d95' 
  AND token = '6bDTqxj7s2d95+tqkeGIdBrNXNjyF9+pjOM1/r9dWDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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