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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89950f42e3df5c54fd18862a1f7590bf0822ac4940c8c2b9dd2c93cd1774a1d6' 
  AND token = '6Tm0/98MLYETRh8KtJUz7o0Y3Dvbg0LQdOasAM1WhLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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