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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd97fd542be44a3c6cfd6e0ca9662a51cb0492d2839baf24aa44e8dfdad3760f' 
  AND token = 'FEcZMx1jHab/5jz8e3QAYcLkUPZYlXyH0bK+ChjAkT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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