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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa829ec027be8c07f4b4e85afc31c7ac3091bc64c0f0e8153cc3b251b21e9c6c' 
  AND token = '9sTlMzE7qYLbIO088GCZQhcvAQfvHgnfECB8Rqw74N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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