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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea6b64c44b251e813d9dc84e859e14877c4feaf9bb623656890b9a7579c73dd' 
  AND token = 'SFfDW/MmnatyZCWUWO6kfAIA6SGwFx9l3I/E3en/hFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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