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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42607a0827537fbdc05f2a8b5fede49cb73d8cfa62e06eb3c039d47fa0fcf6c8' 
  AND token = 'JQJM7WLqKP8/MPQO/exlf6j65r6mduNj+WtKuCFPk4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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