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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda11c520701a4f345d30a75299f8c92005c5b5701ef811b87f6dcc92d2d09aa' 
  AND token = 'ajFv3ymHgdffkcg2VDwB3XS7R4puKF2YnGtF9DH8L10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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