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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538da6ef6bed6c69e28c2b627b07c31409cdda29bf1161eb681e30687f1e6393' 
  AND token = 'ssAefuynVJCURdHVnos4mq7QuB8JiMpk1YYgQ5mVfX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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