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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c5240c3eb7c29821d14041a404c9d4e09725d33e2a8f38915fa81fd3ddb4e98' 
  AND token = 'VNWIU0Xrj04TT9Z7owSDJBQDM5uDKKCvOKYo5fa26ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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