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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ab9924c98d9fcf4b73c783ed9514f12850e91afbebbe2c24b42c13b8caa33a' 
  AND token = 'Hu1PiVtCKei9pw0qCfV5jX98314E05v9RHHkQs5Xu2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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