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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713932edf74843063b797856d7f8cc7e5d28ea3e5d13e3ba60b26f3d00cc11a9' 
  AND token = '+hAT7ReuRe1mRln6RSq+T0ouha1bb7qIyrO7W7YMSww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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