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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ad23b769e616f08f32d61b4624b8c9cdb7663fe03be1a9dc5da0c0917973c4' 
  AND token = 'SByFyTYVw8lXPT7P7dmv1sVgEn3a5ri3Z9eBL7Nmssk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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