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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6908439acc221a92c3b7e4515014fd04eca2038f5a7c9f96bd622da91ed1e408' 
  AND token = 'HLwKCvaL+jgKmckQ4a+bUvsOdnVs9//rVpOW6y0ODWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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