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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24b5e1e7f42a56ab4aacedd2f2e8da8b670c4a937ffd5d6ba3eb82276b95adf' 
  AND token = 'EByzbKKy+5zlyPgnt8zqbbiLnTTT18a9JDVz4KNICsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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