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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ae834e53bd4cf7d518fda36c08721ef8e7461b8e93f4fa176dda128b9776d3' 
  AND token = 'w31ySlIXW5UD/abM584vdbeh1YgKroyuPT9xFUSzu7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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