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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd090325d88248d2ab88df07a1deb884a1c35e68e8c40ea2182dd89c10bc1d7af' 
  AND token = 'vTAE8uP8fC85Upf+/A7ifOq5z16kiMKG3VpcAi/obPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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