Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '373b0d8cb00d00f0190ee886d10ead4fde4c8dadff0e07b0f554b22ff22e2131' 
  AND token = 'AjZM6p+w+wQm3gaJM5tI8pGjBkvLk5KnMj6urtUNhVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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