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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8e415468081679c0a450d230b485bed6ae417b65e76c5a7d585a205a7dd107' 
  AND token = '9RBecWGDYCGbDo6auJcD+bz9oX92kczN6MmeBavy1KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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