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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ff85633ec37e7f7f72f44c0a55b5620d84e85154d2f634f7e4a307bb29be93' 
  AND token = 'FimugkngIrO+lvVf0RkY3ItZcE6S3p9W7cRxShImTuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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