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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cddec1b66156b5647a0b93f1f2b22c94d5b162791e94a22e7c14896a7b2c8427' 
  AND token = 'h2GJ4R/FMEgtrqKgCiOvOFOkHegqNHQhWy/LKQmN70k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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