SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44c9f8323b95ece2a5b86ac1d85771a5a83f2ff64805b6270cfd4afc7080cdb' 
  AND token = '/lFPUQeG1p7HPTps+qIjfYX4xltfLxjjqH11JYo2g2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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