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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b95fb4825630fc8467451ae2e8e1b6175c73855949a75d09f86b13c7293949a' 
  AND token = '8+0dmCBZ0QiQpBbSpJNOWxP97VBPE7WJ4Ul4wSkXy8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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