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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ed93630078bb1815e5cc197181a7c949af90cf6298105b5a8dd59bec01e805' 
  AND token = '9lF4cdv5aM97W+OQ3ottcC5jFP1/u5aJSaru/t2gBhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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