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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b0e948d429d28c5cdcca7893fa2ef05d3d2cee60c645b49eb6906dc049f29c' 
  AND token = 'jSTSaxirtvXUOB+DlIHOZ63f/1ROoMyqytj0X1Zqpok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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