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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7062728285bc038730749b306c71732a4f1162d363f34b6166e7d67f03889981' 
  AND token = 'yQEoZozvpGYZCEmXraO+LPVFTPEvSX2NxtcIrm1NRkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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