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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5504fa6c37903d73457fcfd6d8c49e6a75238355d76b1085b67c9f3881444d39' 
  AND token = 'UIVRaIxDLJPG93Lp14cOe+QO53WCZ9bGEQ/IoE07rP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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