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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913f45d006b95c9e21e21800483257a6a3d58b04c383e24fe9c4ebcb91c326d2' 
  AND token = 'r0dhLcAnWR22AxwxlZJ9Chz5wDYhrVFbGAY2h1joey4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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