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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a803cc76ca7da3dcd1a48ab720b45314f1f7ae5fb566ed102d90e73a1929699e' 
  AND token = '60exJOM2z8cWZXM7qzX6btocGKRxrEwcYPsob6WbfZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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