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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98ff3cc89166dc93a117ddfb50c423213418c54c2c32c432fa46a70904d64ed' 
  AND token = 'NiLJzLTf76n++bNG3bdd6MkZRchCOXhsZgnKpm3iJJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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