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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3495dc51fbc0cae281f4475f029eb16e3a79a7c15cfbc31c533f869cedd34de' 
  AND token = 'Nx5FmW6ZcIvQhxafgWaQ2MexabVlQ/Hgpxmg3sciLlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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