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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3fa7087697f55102282eecaa6ad35037d2a85e91ed4461e6d23d5549119bb7' 
  AND token = 'l1h7TZLzlq7lIS6bRoecsY+RyKtHCqz4+76t6DSFLng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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