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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63efab4f8c86c79d74463db9ab70053aefb07656ed7413289b4dcace13a2714d' 
  AND token = '6ndCn+HvFQtN6e0MO7tACjE9whQvNuLN1XKubE9asNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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