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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d6ce6eb2a5b6bce1760cfe9c7905a5f2e7846e8cce9a4d7ea9c2cfe4879892' 
  AND token = '8HGno7eRn3LyoeHVM8L3mmUawnT0wDpP9ag0TgYKaxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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