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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859c60c06aa5973ffbfa0a20d4cbd51a803487a3edee18952bbfaf130f17ab22' 
  AND token = 'miRGl1z8bODcb7o7d+MjLXkeR4ZfIfXofVb7sBZhj5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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