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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '398d13dd5c9ab68ea07a1211da7972c141915798af467ae34b6b8dc792dd68fb' 
  AND token = 'QwH8PFVf7vPeJw7EH0lJK3zOkl4Xqey6he2HnfRImT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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