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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b8d827c322a2599ee155b9ff13832320058d9be538e392b607fa491ec0b5a1' 
  AND token = 'Ie2hFootJTo/z8n5ukChCh2Tu+NJbzuFSc/5OVWNfFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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