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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218f872adb674adaa4fca3bc80fd82b7bd91ed86067c6e49689e4396b6e33c3e' 
  AND token = 'oBjiKqmGAfYvoyD1VYb4fLcshikRNvBjX45xF8Bd1xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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